Wonder Woman: Paradise Now!
What if Diana arrived in our world during the Kamandi future
Steve Trevor discovered Paradise Island in the year 2010, but decided to stay there in Paradise for a few centuries. When Diana finally convinced him to take her to Man's World they found that earth had become the hellhole of Kamandi's stories.
We could see the amazons actually come back to an almost empty world and recreate society in their image over 2 centuries. Now that they can create a perfect world on their own terms, will they make an utopia or will they repeat the sins of Man? We see a new civilization rise up under the leadership of the amazons that expand all over the world using their unique technology.
It would be interesting to see Diana's struggle with Man's World being everything the amazons predicted and her being in the middle of this effort to create society with her sisters. And Steve Trevor could have an interesting arc as he lets the guilt in him make him an Amazonian fanatic.
And to add some tension make it so Ares did all of this, and is out there in Space destroying other civilizations
This would be the Wonder Woman equivalent of Superman Red Son. Diana would maintain her drive to challenge herself and push others to reach their full potential, and keep her ethical nature, but in a very different world.